1221514202015 has 4 divisors (see below), whose sum is σ = 1465817042424. Its totient is φ = 977211361608.

The previous prime is 1221514202009. The next prime is 1221514202017. The reversal of 1221514202015 is 5102024151221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1221514202015 - 2¹⁸ = 1221513939871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221514202017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122151420197 + ... + 122151420206.

It is an arithmetic number, because the mean of its divisors is an integer number (366454260606).

Almost surely, 2^{1221514202015} is an apocalyptic number.

1221514202015 is a deficient number, since it is larger than the sum of its proper divisors (244302840409).

1221514202015 is an equidigital number, since it uses as much as digits as its factorization.

1221514202015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 244302840408.

The product of its (nonzero) digits is 1600, while the sum is 26.

Adding to 1221514202015 its reverse (5102024151221), we get a palindrome (6323538353236).

The spelling of 1221514202015 in words is "one trillion, two hundred twenty-one billion, five hundred fourteen million, two hundred two thousand, fifteen".